Ok, the deal with Wonder Man in the "With an Iron Fist" world was that Tony Stark, the fascistic bastard dictator of the entire world, finally devised a way to kill his reality's Hulk. He dropped a bomb that released a radiation storm so intense that not even the Hulk could absorb it all. Unfortunately, Wonder Man was nearby when he did it. Since Simon's made of ionic energy, he didn't die but rather absorbed a bunch of the radiation and some of the Hulk's genetic matter. That mixed with his ionic physiology to make him even stronger than the Hulk. He secluded himself with Dr. Strange and the Scarlet Witch, and he and Stark basically had an agreement that they'd just leave each other alone.
Problem is, Tony Stark wanted to conquer Attilan because the Inhumans were the only source of resistance left on his world. Their force field technology was too advanced for him to breach because it was made by Reed Richards, but Reed made a key that could bypass the force field. Wonder Man had it. Tony sent Weapon X after the key and, while trying to retrieve it, Wonder Man fights them. He's kicking their asses until Gambit uses a device that Stark gave him--it creates a temporary portal to the Negative Zone and sucks Wonder Man and a member of Weapon X in. And that's that.